<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link type="text/css" rel="stylesheet" href="main.css">
    <link type="text/css" rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons&display=swap">
</head>
<body>
<div id="app">
    <input type="number"v-model="duration">
    <button type="button" @click="showNotify">show notify</button>
</div>

    <script src="https://cdn.jsdelivr.net/npm/vue@3.0.10/dist/vue.global.js"></script>
    <script src="main.bundle.js">

    </script>
</body>
</html>
